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I would suspect that it's probably a hardware issue - backlash basically. The head is deviating out on each layer to form the button shape, but then not moving all the way back to the original position as it should when it makes the small movement back to the original line.

Check the tension of your belts - especially the short belt for which ever axis the head isn't traveling far enough back along.

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No, slight slipping like that suggests that probably one of your pulleys is slipping and/or the short belt is catching on the wall of the printer. Probably now that the short belts are tighter, they're shifting the pulleys slightly.

Tighten all the set screws really tightly on the pulleys - especially the ones on each end of the short belts for whichever axis is slipping. You might use a permanent marker to mark the pulley and a corresponding spot on the shaft, to you can see if they move independent of one another at all. They must not.

If you got the kit version, then there was probably a spare set of screws included. If you find that the screws in the pulleys can't be tightened enough to fix it in place, try swapping for one of the spare screws. Those are a different profile and can work better sometimes.

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